Super-hydrophobic coating for corrosion resistance and freeze thawing resistance of concrete and preparation method thereof

A super-hydrophobic coating, anti-freeze-thaw technology, applied in anti-corrosion coatings, coatings, etc., can solve the problems of complex coating construction, loss of protective effect, high cost, and achieve the benefits of rapid construction, improved ventilation and waterproofing effect, drying time short effect

Active Publication Date: 2020-05-29
KESHUN WATERPROOF TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are mainly three kinds of concrete protective coatings: 1. Penetrating coatings. Chinese patent CN104926366A introduces a coating that can penetrate 3-5mm into the concrete. It can effectively prevent the entry of chloride ions, but it may appear under high water pressure. Seepage; 2, film-forming coating, Chinese patent CN108546483A has introduced a kind of film-forming coating, this coating can completely seal the entry of water after brushing on the concrete surface and can bear certain water pressure, but the water vapor inside the concrete will 3. Composite coating, Chinese patent CN106431103A introduces a composite coating, using at least two coatings to brush on the concrete surface before and after, this method combines penetration and film formation, but this kind Coating construction is complex and costly

Method used

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  • Super-hydrophobic coating for corrosion resistance and freeze thawing resistance of concrete and preparation method thereof
  • Super-hydrophobic coating for corrosion resistance and freeze thawing resistance of concrete and preparation method thereof
  • Super-hydrophobic coating for corrosion resistance and freeze thawing resistance of concrete and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A kind of superhydrophobic coating that is used for concrete anticorrosion, freeze-thaw resistance, its composition is calculated as follows by mass parts:

[0030] 90 parts of polymethyl hydrogen siloxane;

[0031] 4 parts of fumed hydrophobic silica;

[0032] Op-10 0.2 parts;

[0033] Span-80 1.0 parts;

[0034] 0.5 parts of TT-60;

[0035] 4.3 parts of water.

[0036] Wherein, the gas-phase hydrophobic silica is Evonik Degussa gas-phase hydrophobic silica R972, with a particle size of 7-16nm and a specific surface area of ​​80-280m 2 / g.

[0037] The preparation process of the superhydrophobic coating for concrete anticorrosion and freeze-thaw resistance described in this embodiment is as follows:

[0038] S1: Add 43g of water, 2g of op-10 and 10g of Span-80 into a 2L reactor, stir, disperse and shear at 1000rpm for 10min at room temperature;

[0039] S2: Add 5g of TT-60 to the system in step S1, increase the rotation speed to 2000rpm, then add 900g of polymet...

Embodiment 2

[0042] A kind of superhydrophobic coating that is used for concrete anticorrosion, freeze-thaw resistance, its composition is calculated as follows by mass parts:

[0043] 94 parts of polymethyl hydrogen siloxane;

[0044] 6.0 parts of fumed hydrophobic silica;

[0045] Wherein, the gas-phase hydrophobic silica is Evonik Degussa gas-phase hydrophobic silica R104, with a particle size of 7-16nm and a specific surface area of ​​80-280m 2 / g.

[0046] The preparation process of the superhydrophobic coating used for concrete anticorrosion and freeze-thaw resistance described in this example is as follows: add 940g polymethylhydrogensiloxane to a 2L reactor and increase the rotating speed to 2000rpm, then drop and shear for 30min The rotation speed was reduced to 1000rpm, and then 60g of hydrophobic silica was added, dispersed and sheared for 30min, and a stable transparent paste was obtained.

Embodiment 3

[0048] A kind of superhydrophobic coating that is used for concrete anticorrosion, freeze-thaw resistance, its composition is calculated as follows by mass parts:

[0049] 84 parts of polymethyl hydrogen siloxane;

[0050] 6 parts of fumed hydrophobic silica;

[0051] Op-10 0.5 parts;

[0052] Span-80 2.5 parts;

[0053] 0.2 parts of TT-60;

[0054] 6.8 parts of water;

[0055] The gas-phase hydrophobic silica is Evonik Degussa gas-phase hydrophobic silica R816, with a particle size of 7-16nm and a specific surface area of ​​80-280m 2 / g.

[0056] The preparation process of the superhydrophobic coating used for concrete anticorrosion and freeze-thaw resistance according to the present invention is basically the same as that of Example 1 except for the amount of components, and will not be repeated here.

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Abstract

The invention discloses a super-hydrophobic coating for corrosion prevention and freeze thawing resistance of concrete and a preparation method thereof. The super-hydrophobic coating for corrosion prevention and freeze thawing resistance of concrete comprises the following components in parts by mass: 78-96 parts of polymethylhydrosiloxane; 4-8 parts of gas-phase hydrophobic silicon dioxide; 0-0.5parts of Op-10; 0-2.5 parts of span-80; 0-1.0 parts of a thickening agent; and 0-15 parts of water. The super-hydrophobic coating for corrosion prevention and freeze thawing resistance of concrete can form a super-hydrophobic structure on the surface of concrete to prevent corrosion of liquid water and chloride ions; and water vapor in the concrete can escape through the coating, so that erosionof the water vapor to the interior of the concrete is reduced. The super-hydrophobic coating has good permeability, waterproofness and freeze-thaw resistance, is suitable for corrosion prevention andfreeze-thaw resistance of a concrete structure, is high in solid content and short in drying time, facilitates rapid construction and can greatly prolong the service life of concrete.

Description

technical field [0001] The invention relates to the field of waterproof building materials, in particular, the invention relates to a superhydrophobic coating for anticorrosion and freeze-thaw resistance of concrete and a preparation method thereof. Background technique [0002] Concrete structure has always been considered as an energy-saving, economical, and extremely versatile artificial durable material, and it is one of the most widely used structural forms at present. However, with the aging of structures and the aggravation of environmental pollution, its durability has attracted more and more attention from researchers at home and abroad. According to statistics, the repair cost of concrete in the United States is 250 billion US dollars per year, of which 150 billion is used for bridge concrete repair. In Canada, the cumulative cost of maintaining and repairing just one 25-meter-high dam damaged by alkali aggregates is as high as 1.5 billion Canadian dollars. The c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/05C09D5/08C09D7/61C09D7/44
CPCC09D183/04C09D5/08C09D7/61C09D7/44C09D7/70C08K2201/011C08K2201/003C08K2201/006C08K7/26
Inventor 胡伟华龚兴宇杨小育刘勤
Owner KESHUN WATERPROOF TECH CO LTD
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